TW201411005A - Caliper brake device - Google Patents

Abstract

The caliper brake device is provided with: a guide plate for supporting a brake shoe; anchor pins for supporting the guide plate and which are provided on the main caliper body so as to advance and retract freely; a piston provided on the main caliper body so as to advance and retract freely; a piston plate that is secured to the piston and is supported by the anchor pins; an elastic membrane provided so as to define a pressure chamber inside the main caliper body and which moves the brake shoe by means of the piston, piston plate and guide plate; and a middle member disposed between the piston plate and the guide plate. By the middle member being interposed between the piston plate and the guide plate, a gap is formed between the piston plate and the guide plate.

Description

Brake caliper device

The present invention relates to a brake caliper device that brakes the rotation of a wheel by imparting a frictional force to a brake disk that rotates together with the wheel.

Conventionally, in a railway vehicle or the like, a brake device that brakes the rotation of a wheel by a fluid pressure such as a hydraulic pressure or an air pressure is used.

JP 2011-236958 A discloses a brake caliper device in which a piston is moved by expanding a diaphragm to increase air pressure, and a brake shoe is slidably attached to a brake disc of a wheel by movement of the piston.

In the above brake caliper device, the brake shoe is supported by the guide, and the guide is fixed to the piston. The frictional heat generated when the brake shoe is slid onto the brake disc is transmitted through the guide and the piston to the diaphragm disposed on the back of the piston. Therefore, the film which is an elastic film has a problem that it is easily deteriorated thermally.

SUMMARY OF THE INVENTION An object of the present invention is to provide a brake caliper device capable of suppressing transmission of frictional heat generated when a brake shoe and a disk are slid to an elastic film.

According to an aspect of the present invention, a brake caliper device for braking a wheel by imparting a frictional force to a disk that rotates together with a wheel is provided. The brake caliper device includes: a caliper body supported by the vehicle body; and a shovel blade capable of imparting friction by sliding the disk; the guide plate, Supporting the above-mentioned brake shoe; driving the pin to support the guide plate, and being freely disposed on the caliper body; the piston is freely disposed on the caliper body; the piston plate is fixed to the front of the piston, and is driven by the above a resilient film disposed on the back surface of the piston to form a pressure chamber in the caliper body, elastically deformed by the operating fluid pressure in the pressure chamber, and the shovel is driven through the piston, the piston plate and the guide plate The sheet moves; the intermediate member is disposed between the piston plate and the guide plate. The intermediate member is interposed between the piston plate and the guide plate, whereby a gap is formed between the piston plate and the guide plate.

1‧‧‧ Wheels

1A‧‧‧ disc

10‧‧‧ caliper body

11‧‧‧1st caliper arm

12‧‧‧2nd caliper arm

13‧‧‧ caliper yoke

14‧‧‧ bracket

20‧‧‧Support frame

21‧‧‧Slide

22‧‧‧ dust cover

30‧‧‧煞Cars

31‧‧‧

32‧‧‧Plywood

41‧‧‧ Guide

41A‧‧‧Kap

41B‧‧‧ inserted through hole

41C‧‧‧ fitting slot

41D‧‧‧Gap section

42‧‧‧ gap

50‧‧‧Regulator

51‧‧‧Drive

51A‧‧‧Flange

51B‧‧‧ annular groove

52‧‧‧ Anchor

53‧‧‧ sales support department

54‧‧‧Restoring spring

55‧‧‧ dust cover

60‧‧‧Extrusion mechanism

61‧‧‧Cylinder block

62‧‧‧ Pressure chamber

63‧‧‧ diaphragm

63A‧‧‧The outer edge

63B‧‧‧Apartment

63C‧‧‧Folding

64‧‧‧ piston plate

64A‧‧‧1st containment recess

64B, 71A, 101A‧‧‧ through jack

64C‧‧‧ insertion hole

65‧‧‧Intermediate components

65A‧‧‧

66‧‧‧ caliper cover

67‧‧‧Bolts

68‧‧‧through hole

69‧‧‧ dust cover

70‧‧‧Piston

71‧‧‧2nd containment recess

72‧‧‧Cover components

81‧‧‧ bolt

82‧‧‧ nuts

83‧‧‧Washers

84‧‧‧round spring

90‧‧‧ air layer

100‧‧‧ brake caliper device

101‧‧‧heating body

Fig. 1 is a plan view showing a brake caliper device according to an embodiment of the present invention.

Fig. 2 is a front elevational view showing the brake caliper device of the embodiment.

Figure 3 is a cross-sectional view of the brake caliper device along the III-III side of Figure 2.

Fig. 4 is a cross-sectional view showing a modification of the brake caliper device of the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the overall configuration of the brake caliper device 100 of the present embodiment will be described with reference to Figs. 1 and 2 .

The brake caliper device 100 is a brake device for a railway vehicle that uses air as an actuating fluid. The brake caliper device 100 applies a frictional force to the disk 1A by sliding the brake shoe 30 to the disk 1A of the wheel 1, and brakes the rotation of the wheel 1.

The brake caliper device 100 includes a caliper body 10, a support frame 20 that supports the caliper body 10 and is fixed to a trolley (vehicle body) (not shown). Moreover, the brake caliper device 100 is provided with: The shoe piece 30 is disposed on the caliper body 10 with the wheel 1 interposed therebetween, and can be frictionally biased by the disk 1A of the wheel 1; the guide plate 41 supports the brake shoe 30; The driving pin 51 is provided to the caliper body 10 so as to be movable forward and backward, and supports the guide 41; and the pressing mechanism 60 presses the boring shoe 30 to the disk 1A by air pressure.

On both outer and inner end faces of the wheel 1, a disk 1A in which the brake shoe 30 is slid is formed. The disk 1A is a brake disk that rotates in the same manner as the wheel 1. Further, in the brake caliper device 100, the disk 1A is integrally formed on the wheel 1, but the disk 1A may be attached to the wheel 1 as another member.

As shown in FIG. 1, the caliper body 10 includes a first caliper arm 11 and a second caliper arm 12 extending across the wheel 1, a caliper yoke 13 connecting the caliper arms 11, 12, and a bracket 14 from the caliper yoke. 13 is extended to the opposite side of the wheel 1 side. The caliper body 10 is attached to the support frame 20 through the bracket 14.

As shown in FIGS. 1 and 2, the bracket 14 of the caliper body 10 is formed to face the support frame 20, and the bracket 14 and the support frame 20 are coupled by a pair of upper and lower slide pins 21.

The slide pin 21 is provided to penetrate the support frame 20 and the bracket 14 of the caliper body 10. Both ends of the slide pin 21 are coupled to the bracket 14 of the caliper body 10. The caliper body 10 is supported by the support frame 20 via the slide pin 21 so as to be movable in the axial direction of the slide pin 21 (floating support).

Further, the exposed portion of the slide pin 21 located between the support frame 20 and the bracket 14 is covered by a dust boot 22 made of rubber to prevent dust such as dust and dust. .

The disc 1A facing the wheel 1 of the wheel 1 is provided at the respective distal ends of the first caliper arm 11 and the second caliper arm 12 of the caliper body 10. The brake shoe 30 has a lining 31 that is slidably attached to the disc 1A of the wheel 1.

The brake shoe 30 on the side of the first caliper arm 11 is pressed by the pressing mechanism 60 to be slid to the disk 1A of the wheel 1. The brake shoe 30 is fixed to the guide 41 by a back surface on the opposite side to the surface on which the sheet 31 is provided. . In the guide plate 41, an engagement groove 41A engageable with the engagement plate 32 (see Fig. 1) provided on the back surface of the brake shoe 30 is formed in the longitudinal direction. The guide plate 41 is supported by the caliper body 10 by a driving pin 51 (see FIG. 3) which will be described later.

In the above-described brake caliper device 100, when the brake shoe 30 on the side of the first caliper arm 11 pressed by the pressing mechanism 60 is slidably attached to a disk 1A of the wheel 1, the caliper body 10 is slid with respect to the support frame 20 When the axial direction of 21 moves, the brake shoe 30 on the side of the second caliper arm 12 is slidably attached to the other disk 1A of the wheel 1. On the other hand, the rotation of the wheel 1 is braked by the frictional force generated when the two pieces of the brake shoe 30 are engaged with the disk 1A.

Next, an internal structure of the first caliper arm 11 of the caliper body 10 will be described with reference to Fig. 3 .

At the front end portion of the first caliper arm 11 of the caliper body 10, a pair of upper and lower adjusters 50 and a pressing mechanism 60 between the adjusters 50 are provided.

The adjuster 50 adjusts the initial position of the kick shoe 30 facing the disc 1A of the wheel 1. The adjuster 50 is attached to the upper end portion and the lower end portion of the first caliper arm 11 by an anchor bolt 52, respectively.

The adjuster 50 includes a pin receiving portion 53 that is fixed to the caliper body 10 by the anchor 52, and a driving pin 51 that is provided to be detachably provided with respect to the pin receiving portion 53 and that supports the boring shoe 30 with respect to the caliper body 10, The return spring 54 that biases the driving pin 51 in the direction in which the pin receiving portion 53 enters.

The driving pin 51 is formed as a bottomed cylindrical member, and is provided to the pin support freely and retractably. In section 53.

The driving pin 51 located at the upper end portion of the first caliper arm 11 has a flange portion 51A that protrudes in the radial direction from the outer circumferential surface. An insertion hole 41B through which the driving pin 51 is inserted is formed in the upper end portion of the guide plate 41, and a fitting groove 41C fitted to the flange portion 51A of the driving pin 51 is formed around the insertion hole 41B. The driving pin 51 on the upper end side supports the guide 41 by the flange portion 51A being fitted into the fitting groove 41C of the guide 41.

The driving pin 51 located at the lower end portion of the first caliper arm 11 has an annular groove portion 51B recessed in the outer peripheral surface. A U-shaped notch portion 41D through which the driving pin 51 is inserted is formed in a lower end portion of the guide plate 41, and a part of the notch portion 41D is engaged with the annular groove portion 51B of the driving pin 51. The driving pin 51 on the lower end side is supported by the annular groove portion 51B by the notch portion 41D of the guide plate 41 to support the guide plate 41.

When the brake shoe 30 is close to the disk 1A, the pair of upper and lower driving pins 51 are pulled out by the guide 41 which is displaced together with the brake shoe 30. The driving pin 51 holds the brake shoe 30 against the force to move the brake shoe 30 in the circumferential direction when the brake shoe 30 is slidably engaged with the disk 1A.

A return spring 54 is provided inside the driving pin 51. The return spring 54 is configured, for example, as a coil spring. The return spring 54 is an elastic member that returns the driven pin 51 to the initial position by the elastic pressure when the brake state is changed to the non-braking state.

Further, the driving pin 51 is configured such that a portion exposed to the outside during braking is covered by a rubber dust cover 55. Therefore, it is possible to prevent dust such as dust and dust from entering the pin receiving portion 53.

The pressing mechanism 60 includes a cylinder 61 formed in the first caliper arm 11 of the caliper body 10, and a piston 70 that is provided to be retractable with respect to the cylinder 61 so as to abut against the piston 70. In the state of the back surface, the diaphragm 63 is provided in the caliper body 10 so as to be divided into a pressure chamber 62, a piston plate 64 supported by the driving pin 51 in a state of being fixed to the piston 70, and an intermediate member 65 disposed on the front surface of the piston plate 64.

The pressing mechanism 60 elastically deforms the diaphragm 63 by adjusting the air pressure in the pressure chamber 62 to advance and retract the piston 70 with respect to the cylinder 61. At the time of braking, the pressing mechanism 60 withdraws the piston 70 from the cylinder 61, and presses the brake shoe 30 toward the disk 1A of the wheel 1 through the piston plate 64, the intermediate member 65, and the guide 41.

The cylinder 61 is formed in a slightly elliptical shape, and the piston 70 is accommodated in the cylinder 61. A caliper cover 66 that closes the open end of the piston 70 on the back side is fixed to the cylinder 61 via a bolt 67.

The diaphragm 63 is, for example, an elastic film made of rubber. The outer edge portion 63A of the diaphragm 63 is disposed on the back side of the piston 70 in a state of being sandwiched by the end face of the cylinder 61 and the end surface of the caliper cover 66. The pressure chamber 62 is formed by the diaphragm 63 and the caliper cover 66. The diaphragm 63 is elastically deformed in accordance with the air pressure in the pressure chamber 62 to advance and retract the piston 70. Further, the pressure chamber 62 is connected to the external air pressure supply source through the through hole 68 (refer to FIG. 2).

The diaphragm 63 has an outer edge portion 63A, an abutting portion 63B that abuts against the back surface of the piston 70, and a folded portion 63C that is continuously formed between the outer edge portion 63A and the abutting portion 63B.

The outer edge portion 63A of the diaphragm 63 is sandwiched by the cylinder 61 and the caliper cover 66. Since the outer edge portion 63A functions as a sealing member, the airtightness of the pressure chamber 62 can be ensured.

The folded portion 63C of the diaphragm 63 is located in the gap between the cylinder 61 and the piston 70. The folded portion 63C is configured to be deformable into a folded state and an extended state according to the air pressure in the pressure chamber 62.

The abutting portion 63B of the diaphragm 63 abuts against the back surface of the piston 70, and presses the piston 70 in accordance with the air pressure in the pressure chamber 62. When the air pressure in the pressure chamber 62 is increased and the diaphragm 63 is expanded, the piston 70 pressed by the abutting portion 63B moves in the withdrawal direction.

The piston 70 is a slightly elliptical plate member. The piston 70 is held in the cylinder 61 by the abutting portion 63B of the diaphragm 63 and the folded portion 63C. A dust cover 69 is provided between the piston 70 and the cylinder 61. The dust cover 69 is configured as a rubber bellows member. One end of the dust cover 69 is fixed to the outer periphery of the open end of the front side (wheel side) of the cylinder 61, and the other end of the dust cover 69 is fixed to the outer periphery of the front end of the piston 70 (the outer circumference of the wheel side). Dust, dust, and the like can be prevented from entering the cylinder 61 by the dust cover 69.

A piston plate 64 is mounted on the front of the piston 70. The piston plate 64 is a plate member provided in parallel with the guide plate 41. The piston plate 64 and the piston 70 are screwed together with a bolt 81 (a Hexagon socket countersunk head screw) disposed on the front surface side of the piston plate 64 and a nut 82 disposed on the back side of the piston 70. Fasten each other.

On the front surface of the piston plate 64, two first housing recesses 64A that can accommodate the intermediate member 65 and the head of the bolt 81 are formed. Further, a second housing recess 71 that can accommodate the screw portion of the bolt 81 and the nut 82 is formed at a position facing the first housing recess 64A on the back surface of the piston 70. Insertion holes 64B and 71A through which the shaft portions of the bolts 81 are inserted are formed in the bottom surfaces of the first housing recess 64A and the second housing recess 71.

In a state where the head of the bolt 81 is disposed at the bottom portion of the first housing recess 64A, the screw portion of the bolt 81 protrudes through the insertion holes 64B and 71A in the second housing recess 71 configured as an air chamber. The nut 82 disposed at the bottom portion of the second housing recess 71 is screwed to the screw portion of the protruding bolt 81. A gasket is interposed between the nut 82 and the bottom surface of the second receiving recess 71 83 and a disc spring 84 to prevent the bolt 81 and the nut 82 from loosening. Further, a cover member 72 is fitted into the opening end of the second housing recess 71, and the second housing recess 71 is closed by the cover member 72. Further, the gasket 83 is formed into a conical tapered washer, and the circular spring 84 is formed into a conical circular spring.

The bolt 81 disposed in the first housing recess 64A is screwed into the nut 82 disposed in the second housing recess 71 to fix the piston plate 64 to the front side of the piston 70.

Further, an insertion hole 64C into which the upper driving pin 51 is inserted is formed in the upper end portion of the piston plate 64, and an insertion hole 64C into which the lower driving pin 51 is inserted is formed in the lower end portion of the piston plate 64. The piston plate 64 is slidably supported by the driving pin 51 through the insertion hole 64C. The piston plate 64 defines the position of the piston 70 in the cylinder 61 by the driving pin 51 supporting the insertion holes 64C at both ends.

The intermediate member 65 is a member sandwiched between the guide plate 41 and the piston plate 64, and compares the piston 70 and the piston plate 64 with a substantially disk-shaped heat-dissipating member formed of a material having a low thermal conductivity. The intermediate member 65 is formed, for example, of a material obtained by resin-molding glass fibers.

The intermediate member 65 is disposed between the piston plate 64 and the guide plate 41 in a state in which a part of the intermediate member 65 is housed in the first housing recess 64A. In a state of being disposed in the first housing recess 64A, one surface of the intermediate member 65 abuts against the back surface of the guide 41, and the other surface of the intermediate member 65 abuts against the end surface of the head of the bolt 81. The intermediate member 65 has a hole portion 65A penetrating in the thickness direction of the intermediate member 65 in order to block heat conduction to the piston 70 and the diaphragm 63, that is, to improve the heat-dissipating effect. Therefore, heat from the brake shoe 30 is transmitted to the piston 70 side through the intermediate member 65 other than the pocket portion 65A.

The depth of the first housing recess 64A is set to be smaller than the thickness of the intermediate member 65 in the depth direction. Further, the intermediate member 65 is provided to protrude from the first housing recess 64A, Thus, a gap 42 is formed between the piston plate 64 and the guide plate 41.

As described above, the piston plate 64 and the guide plate 41 are connected only through the intermediate member 65, and a gap 42 is formed between the piston plate 64 and the guide plate 41, so that the brake shoe 30 and the disk 1A are generated when sliding. Friction heat is difficult to transfer to the piston 70 and the diaphragm 63.

Further, the piston plate 64 and the piston 70 are configured to form an air layer 90 between the piston plate 64 and the piston 70. The air layer 90 is provided at a position other than the connection position of the piston plate 64 and the piston 70. Since the air layer 90 functions as a heat insulating layer, it is difficult to transmit the frictional heat generated when the brake shoe 30 and the disk 1A are slid to the piston 70 and the diaphragm 63.

Next, the operation of the brake caliper device 100 will be described with reference to Figs. 1 and 3 .

When the brake operation is performed by the driver or the like while the railway vehicle is traveling, the air pressure supply source supplies air to the pressure chamber 62 of the brake caliper device 100, and the air pressure in the pressure chamber 62 is increased. When the air pressure is increased as described above, the diaphragm 63 expands, and the piston 70 pressed by the abutting portion 63B of the diaphragm 63 moves toward the disk 1A side of the wheel 1. When the piston 70 moves, the brake shoe 30 also moves toward the disk 1A side of the wheel 1 through the piston plate 64, the intermediate member 65, and the guide 41. At this time, the driving pin 51 of the support guide 41 is also moved by the pin receiving portion 53 to be extracted.

When the brake shoe 30 on the first caliper arm 11 side is slidably attached to a disk 1A of the wheel 1 by the movement of the piston 70, the caliper body 10 moves in the axial direction of the slide pin 21 with respect to the support frame 20, and The brake shoe 30 on the side of the caliper arm 12 is slidably attached to the other disk 1A of the wheel 1. On the other hand, the rotation of the wheel 1 is braked by the frictional force generated when the blade 31 is slidably attached to the disk 1A.

In the brake caliper device 100, the piston plate 64 and the guide plate 41 only pass through the intermediate member The connection 65 forms a gap 42 between the piston plate 64 and the guide 41, so that the transfer of frictional heat to the piston 70 and the diaphragm 63 is suppressed.

On the other hand, when the brake operation is released by the driver or the like, the air in the pressure chamber 62 is discharged through the through hole 68, and the diaphragm 63 is contracted. At this time, the driving pin 51 is pulled back into the pin receiving portion 53 by the elastic pressure (restoring force) of the return spring 54 provided inside the adjuster 50. Thereby, the piston 70 is moved to the initial position before braking, and the brake shoe 30 is separated by the disk 1A of the wheel 1. As a result, the wheel 1 can be rotated without being affected by the brake caliper device 100.

According to the brake caliper device 100 of the present embodiment described above, the following effects can be obtained.

In the brake caliper device 100, the guide 41 supporting the brake shoe 30 and the piston plate 64 fixed to the piston 70 are connected through the intermediate member 65. As described above, the intermediate member 65 is interposed therebetween, and a gap 42 is formed between the piston plate 64 and the guide plate 41. By this gap 42, the frictional heat generated by the sliding of the disk 1A of the wheel 1 and the brake shoe 30 is difficult to transmit to the piston 70. Thereby, frictional heat can be suppressed from being transmitted to the diaphragm 63 disposed on the back surface of the piston 70. By suppressing the transmission of frictional heat to the diaphragm 63, even when the braking force of the brake shoe 30 is higher than in the conventional case, thermal deterioration of the diaphragm 63 can be prevented.

Since the intermediate member 65 is configured as a heat-dissipating member, it is possible to further suppress the transfer of frictional heat to the diaphragm 63.

Since the first housing recessed portion 64A that can accommodate the intermediate member 65 is formed in the piston plate 64, the intermediate member 65 can be easily disposed between the piston plate 64 and the guide plate 41.

The depth of the first housing recess 64A is set to be smaller than the thickness of the intermediate member 65 in the depth direction, and the intermediate member 65 is provided to protrude from the first housing recess 64A. With this, A gap 42 can be surely formed between the piston plate 64 and the guide plate 41.

Since the intermediate member 65 has the hole portion 65A formed to penetrate in the thickness direction, the heat-insulating performance of the intermediate member 65 can be improved. Since the intermediate member 65 other than the heat transmitting hole portion 65A from the brake shoe 30 is transmitted to the piston 70 side, the transfer of the friction heat to the diaphragm 63 can be further suppressed.

The piston plate 64 is attached to the front surface of the piston 70 through a bolt 81 disposed at the bottom of the first housing recess 64A of the piston plate 64 and a nut 82 disposed at the bottom of the second housing recess 71 of the piston 70. A portion of the frictional heat is transmitted to the diaphragm 63 through the intermediate member 65, the bolt 81, the nut 82, and the piston 70. However, since the screw portion and the nut 82 of the bolt 81 are housed in the second housing recess 71, the heat transmitted from the bolt 81 to the nut 82 is not directly transmitted to the diaphragm 63. Therefore, the transfer of the frictional heat to the diaphragm 63 can be further suppressed.

A circular spring 84 is interposed between the nut 82 and the bottom surface of the second housing recess 71, and the nut 82 is screwed to the bolt 81 via the circular spring 84. When the circular spring 84 is not used, the entire end surface of the nut 82 is in contact with the bottom surface of the second housing recess 71. However, when the circular spring 84 is interposed between the nut 82 and the bottom surface of the second housing recess 71, Since the circular spring 84 has a conical shape, only one of the end faces of the nut 82 is in contact with the circular spring 84. Therefore, heat transmitted from the bolt 81 to the nut 82 is hard to be transmitted to the piston 70, and the transfer of frictional heat to the diaphragm 63 can be further suppressed. Further, the vibration of the vehicle or the frictional heat is repeatedly input to the bolt 81 and the nut 82. However, the external force or the like is absorbed by the spring action of the circular spring 84, and the looseness of the bolt 81 and the nut 82 can be prevented.

Further, since the second housing recess 71 is formed as an air chamber, heat transmitted to the nut 82 accommodated in the second housing recess 71 is hardly transmitted to the diaphragm 63, and the transfer of friction heat to the diaphragm 63 can be further suppressed.

Although the embodiments of the present invention have been described above, the above embodiments are only a part of the application examples of the present invention, and the technical scope of the present invention is not limited to the specific configuration of the above embodiments.

In the brake caliper device 100, the bolt 81 is disposed in the first housing recess 64A of the piston plate 64, and the nut 82 is disposed in the second housing recess 71 of the piston 70. However, the present invention is not limited thereto. For example, the bolt 81 may be disposed in the second housing recess 71, and the nut 82 may be disposed in the first housing recess 64A. In this case, the washer 83 and the circular spring 84 are interposed between the nut 82 and the bottom surface of the first housing recess 64A to prevent loosening of the bolt 81 and the nut 82.

Further, in the brake caliper device 100, the intermediate member 65 has one hole portion 65A penetrating in the thickness direction, but the shape and number of the hole portions 65A are not limited thereto. Therefore, the hole portion 65A may be formed in plural in one intermediate member 65, and may be formed in a groove shape that does not penetrate the intermediate member 65.

Further, as shown in FIG. 4, in the brake caliper device 100, a heat insulator 101 may be interposed between the piston 70 and the piston plate 64. The heat insulator 101 is a substantially disk-shaped heat-dissipating member in which the piston 70 and the piston plate 64 are made of a material having a low thermal conductivity. The heat insulator 101 is formed, for example, of a material obtained by resin-molding glass fibers. The heat insulator 101 is provided between the connection position of the piston 70 and the piston plate 64, the front surface of the second housing recess 71 of the piston 70, and the back surface of the first housing recess 64A of the piston plate 64. The heat insulator 101 has an insertion hole 101A through which the shaft portion of the bolt 81 is inserted.

By providing the heat insulator 101 as described above, it is difficult for the friction heat to be transmitted from the piston plate 64 to the piston 70, and the transfer of the friction heat to the diaphragm 63 can be further suppressed.

The present application claims priority on the basis of the JP 2012-173814 filed on Jan.

1‧‧‧ Wheels

1A‧‧‧ disc

10‧‧‧ caliper body

30‧‧‧煞Cars

31‧‧‧

32‧‧‧Plywood

41‧‧‧ Guide

41B‧‧‧ inserted through hole

41C‧‧‧ fitting slot

41D‧‧‧Gap section

42‧‧‧ gap

50‧‧‧Regulator

51‧‧‧Drive

51A‧‧‧Flange

51B‧‧‧ annular groove

52‧‧‧ Anchor

53‧‧‧ sales support department

54‧‧‧Restoring spring

55‧‧‧ dust cover

60‧‧‧Extrusion mechanism

61‧‧‧Cylinder block

62‧‧‧ Pressure chamber

63‧‧‧ diaphragm

63A‧‧‧The outer edge

63B‧‧‧Apartment

63C‧‧‧Folding

64‧‧‧ piston plate

64A‧‧‧1st containment recess

64B, 71A‧‧‧ through jack

64C‧‧‧ insertion hole

65‧‧‧Intermediate components

65A‧‧‧

66‧‧‧ caliper cover

67‧‧‧Bolts

69‧‧‧ dust cover

70‧‧‧Piston

71‧‧‧2nd containment recess

72‧‧‧Cover components

81‧‧‧ bolt

82‧‧‧ nuts

83‧‧‧Washers

84‧‧‧round spring

90‧‧‧ air layer

100‧‧‧ brake caliper device

Claims (12)

A brake caliper device that brakes a wheel by imparting a frictional force to a disk that rotates together with a wheel, and is characterized in that: a caliper body is supported by the vehicle body; and the brake shoe can be slid by the above a disc for imparting friction; a guide plate supporting the brake shoe; driving the pin to support the guide plate, and being freely disposed on the caliper body; the piston being freely disposed on the caliper body; the piston plate being fixed to The front surface of the piston is supported by the driving pin; the elastic film is disposed on the back surface of the piston to form a pressure chamber in the caliper body, and is elastically deformed by the operating fluid pressure in the pressure chamber, and passes through the piston, a piston plate and the guide plate move the brake shoe; and an intermediate member disposed between the piston plate and the guide plate; the intermediate member being interposed between the piston plate and the guide plate, thereby A gap is formed between the piston plate and the above-mentioned guide plate. The brake caliper device according to claim 1, wherein the piston plate includes a first housing recess that houses a part of the intermediate member. The brake caliper device according to claim 2, wherein the depth of the first housing recess is set to be smaller than a thickness of the intermediate member in the depth direction, and the intermediate member is protruded by the first housing recess. The gap is formed between the piston plate and the guide plate. The brake caliper device of claim 2, wherein the intermediate member is configured An end surface that is not accommodated on the side of the first housing recess is in contact with the guide. The brake caliper device according to claim 1, wherein the intermediate member includes a hole portion for controlling heat transfer, and the heat from the brake shoe is transmitted through the intermediate member other than the hole portion to the piston Side pass. The brake caliper device of claim 1, wherein the intermediate member is a heat-dissipating member. The brake caliper device according to claim 2, wherein a second housing recess is formed at a position corresponding to the first housing recess on a rear surface of the piston, and the piston plate and the piston are transmitted through the first housing recess The bolt at the bottom of one of the second receiving recesses and the nut disposed at the other bottom are fastened to each other. The brake caliper device of claim 7, wherein the nut is screwed to the bolt by a circular spring. The brake caliper device according to claim 7, wherein the second housing recess is configured as an air chamber. The brake caliper device of claim 1, wherein the piston and the piston plate are coupled by a heat insulator. The brake caliper device of claim 1, wherein an air layer is further formed between the piston and the piston plate. The brake caliper device according to claim 1, further comprising: a cylinder provided in the caliper body to accommodate the piston; and a dust cover provided between the cylinder and the piston; wherein the dust cover is formed Cylindrical member, One end of the dust cover is fixed to the outer periphery of the front end of the cylinder, and the other end is fixed to the outer periphery of the front end of the piston.